Question

我在onViewCreate方法中使用Fragment。

我正在使用一些行和列创建TableLayout。我想获得单个单元格的高度和宽度（每个单元格具有相同的宽度和高度）。但是，当cell.getHeight（）和cell.getWidth（）方法都返回0.当我使用onPreDraw（）方法时，还有更多，

private TextView cell
private int finalHeight;
private int finalWidth;
public View onCreateView( LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState ) {
    Context contextThemeWrapper = new ContextThemeWrapper( getActivity(), android.R.style.Theme_Holo_Light ); 
    LayoutInflater localInflater = inflater.cloneInContext( contextThemeWrapper );
    View thisView = localInflater.inflate( R.layout.fragment_wizard_table, container, false );

    final TableLayout table = new TableLayout( App.getAppContext() );
    for (hoursIter = 0; hoursIter < hours.length; hoursIter++) {

        TableRow row = new TableRow( App.getAppContext() );
        for (daysIter = 0; daysIter < initDays().length; daysIter++) {

            cell = new TextView( App.getAppContext() )

            // cell.getWidth() here return 0;
        }
    }
    // cell.getWidth() here still returns 0 ;

    cell.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {

        @Override
        public void onGlobalLayout() {
            cell.getViewTreeObserver().removeGlobalOnLayoutListener(this);
            finalWidth = cell.getWidth(); // it's ok here ( work )
            finalHeight = cell.getHeight(); // it's ok here (works)
        }
    });

    // BUT NOW:
    Log.d(TAG, finalWidht + " " ); // returns still 0 ? WHY ?
}

提前感谢您的帮助！

Answer 1

因为最后一行

Log.d（TAG，finalWidht +“”）; //还是0？为什么？

将在ViewTreeObserver将其全局布局侦听器分组之前执行。 ViewTreeObserver有自己的线程来测量布局尺寸。

Fragment中的Android getWidth返回0

1 个答案: